| | | Friday, September 14th, 2012 | | Placed SP Tom Wagner on the 14-day disabled list, retroactive to 09/11/2012. |
| Friday, August 31st, 2012 | | Signed SP Maurice Gould to a 4-year contract extension worth a total of $42,000,000. |
| Monday, August 6th, 2012 | | Sent MR Chris Mills to Triple A Reno for injury rehab. |
| Monday, June 25th, 2012 | | Signed LF Troy Tracy to a 4-year contract extension worth a total of $38,500,000. |
| Monday, May 14th, 2012 | | Placed MR Chris Mills on the 60-day disabled list. | | Purchased the contract of CL Matt Messer from Triple A Reno. |
| Monday, May 7th, 2012 | | Placed CF Bob Reece on the active roster. | | Activated CF Bob Reece from the disabled list. | | Placed SP Tom Wagner on the 60-day disabled list. |
| Monday, April 16th, 2012 | | Placed CF Bob Reece on the 14-day disabled list, retroactive to 04/12/2012. | | Placed CF Bob Reece on the 14-day disabled list, retroactive to 04/12/2012. |
| Friday, February 17th, 2012 | | Signed pitching coach Sylvester Perry to a 4-year, $260,000 per year contract. |
| Saturday, February 4th, 2012 | | Signed bench coach Jason Little to a 5-year, $780,000 per year contract. |
| Tuesday, January 31st, 2012 | | Signed hitting coach Bob Coleman to a 3-year, $250,000 per year contract. |
| Saturday, January 7th, 2012 | | Signed team doctor Tim Fleming to a 5-year, $660,000 per year contract. |
| Thursday, January 5th, 2012 | | Signed pitching coach Albert McGhee to a 4-year, $440,000 per year contract. |
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